Cisco 4G-LTE-ANTM-O-3 Installation Guide Page 68
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PurposeCommand or Action
Sets the IP address and subnet mask for the loopback
interface.
ip address ip-address mask
Example:
Router(config-if)# ip address 10.108.1.1
255.255.255.0
Step 2
Example:
Router(config-if)#
Exits configuration mode for the loopback interface
and returns to global configuration mode.
exit
Example:
Router(config-if)# exit
Step 3
Example:
Router(config)#
What to Do Next
Example
The loopback interface in this sample configuration is used to support Network Address Translation (NAT)
on the virtual-template interface. This configuration example shows the loopback interface configured on the
Fast Ethernet interface with an IP address of 200.200.100.1/24, which acts as a static IP address. The loopback
interface points back to virtual-template1, which has a negotiated IP address.
!
interface loopback 0
ip address 200.200.100.1 255.255.255.0 (static IP address)
ip nat outside
!
interface Virtual-Template1
ip unnumbered loopback0
no ip directed-broadcast
ip nat outside
!
Verifying Configuration
To verify that you have properly configured the loopback interface, enter the show interface loopback command.
You should see a verification output similar to the following example:
Router# show interface loopback 0
Loopback0 is up, line protocol is up
Hardware is Loopback
Internet address is 200.200.100.1/24
MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation LOOPBACK, loopback not set
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/0, 0 drops; input queue 0/75, 0 drops
Cisco 800 Series Integrated Services Routers Software Configuration Guide
40 OL-31704-02
Basic Router Configuration
Configuring a Loopback Interface
- Americas Headquarters 1
- CONTENTS 3
- OL-31704-02 v 5
- OL-31704-02 vii 7
- OL-31704-02 ix 9
- Contents 10
- OL-31704-02 xi 11
- OL-31704-02 xiii 13
- OL-31704-02 xv 15
- OL-31704-02 xvii 17
- OL-31704-02 xix 19
- Error Reporting 407 21
- Exiting the ROM Monitor 409 21
- Audience 23
- Document Organization 23
- Document Conventions 25
- OL-31704-02 xxvii 27
- Product Overview 29
- 2 OL-31704-02 30
- OL-31704-02 3 31
- Cisco 880 Series ISRs 33
- 6 OL-31704-02 34
- OL-31704-02 7 35
- Cisco 890 Series ISRs 36
- Cisco 810 Series ISRs 38
- OL-31704-02 11 39
- 12 OL-31704-02 40
- OL-31704-02 13 41
- 14 OL-31704-02 42
- Basic Router Configuration 43
- Default Configuration 44
- 18 OL-31704-02 46
- Configuring Global Parameters 49
- Configuring WAN Interfaces 50
- 24 OL-31704-02 52
- Data Account Provisioning 53
- Configuring DDR 59
- Configuration for 8705 modem 63
- Push Button in WLAN AP 67
- Configuring Static Routes 69
- Configuring Dynamic Routes 70
- Configuring the NID 75
- Ethernet Data Plane Loopback 78
- OL-31704-02 51 79
- 56 OL-31704-02 84
- On router 2: 93
- Subinterface) 99
- SUMMARY STEPS 100
- DETAILED STEPS 100
- Distribution Delay Two-Way: 103
- OL-31704-02 77 105
- 78 OL-31704-02 106
- Configuring Power Management 107
- Configuring Security Features 109
- Configuring AutoSecure 110
- Configuring Access Lists 110
- Access Groups 111
- Configuring Cisco IOS IPS 112
- URL Filtering 112
- Configuring VPN 113
- 86 OL-31704-02 114
- Configuring the IKE Policy 115
- Enabling Policy Lookup 118
- What to Do Next 122
- Management 129
- Configuring Backup Interfaces 130
- Example: 131
- Console or Auxiliary Port 137
- 116 OL-31704-02 144
- OL-31704-02 117 145
- Configuring ISDN Settings 146
- Configuring Auto-Detect 150
- Configuring Third-Party SFPs 151
- Configuring Ethernet Switches 155
- Ethernet Switches 156
- Spanning Tree Protocol 157
- Cisco Discovery Protocol 157
- Switched Port Analyzer 157
- IGMP Snooping 157
- Overview of SNMP MIBs 158
- Configuring VLANs 160
- 134 OL-31704-02 162
- OL-31704-02 135 163
- Configuring IGMP Snooping 164
- Managing the Switch 165
- Configuring Static Addresses 166
- Voice Ports 167
- Call Control Protocols 168
- Dial Peer Configuration 169
- Other Voice Features 169
- 142 OL-31704-02 170
- Fax Services 171
- 144 OL-31704-02 172
- CHAPTER 9 173
- Legacy Protocol Transport 174
- Configuring Serial Interfaces 175
- Multilink PPP 176
- Keepalive Timer 177
- Frame Relay Encapsulation 177
- Configuring PPP 180
- Configuring Bisync 180
- Enabling the Internal Clock 182
- Setting Transmit Delay 183
- 158 OL-31704-02 186
- OL-31704-02 159 187
- 160 OL-31704-02 188
- Tuning Half-Duplex Timers 190
- 166 OL-31704-02 194
- Configuring Wireless Devices 195
- Root Access Point 196
- OL-31704-02 169 197
- Cisco ScanSafe 198
- OL-31704-02 171 199
- 172 OL-31704-02 200
- Closing the Session 204
- Configuring Wireless Settings 205
- Cisco Express Setup 205
- Configuring Authentication 206
- OL-31704-02 179 207
- Preparing for the Upgrade 210
- Performing the Upgrade 211
- Related Documentation 212
- OL-31704-02 185 213
- Configuring Radio Settings 214
- Radio Tracking 217
- Fast Ethernet Tracking 217
- Overview of Radio Data Rates 218
- Configuring Radio Data Rates 219
- Configuring MCS Rates 221
- 194 OL-31704-02 222
- Enabling World Mode 227
- Transmit and Receive Antennas 229
- Disabling Aironet Extensions 231
- Configuring Protected Ports 234
- Beacon Period and the DTIM 235
- RTS Threshold and Retries 236
- Maximum Data Retries 237
- Configuring WLAN 240
- Displaying Device Information 241
- 214 OL-31704-02 242
- Configuring Security 243
- Configuring MAC Filtering 243
- 216 OL-31704-02 244
- OL-31704-02 217 245
- Station Information 246
- WLAN CLI Interface 247
- Enabling and Disabling WLAN 250
- Configuring the Main SSID 250
- Configuring Guest SSIDs 251
- Hiding an Access Point 252
- Configuring Radio Channel 265
- Configuring 802.11n Options 266
- Configuring the 54g Mode 268
- Configuring the 54g Rate 270
- Configuring 54g Protection 271
- Configuring the Basic Rate 272
- Configuring the RTS Threshold 274
- Configuring the DTIM Interval 274
- Configuring WMM Options 276
- Displaying CPU Statistics 284
- Pinging an Address 286
- OL-31704-02 261 289
- RADIUS Configuration 296
- Defining AAA Server Groups 297
- Default TACACS+ Configuration 301
- Rebooting the Wireless Device 305
- Configuring SNTP 306
- 280 OL-31704-02 308
- Configuring a System Name 310
- Understanding DNS 310
- Creating a Banner 313
- Configuring a Login Banner 314
- Setting up the DHCP Server 321
- Understanding SSH 324
- Configuring SSH 324
- Client ARP Caching 325
- CHAPTER 11 327
- Overview 328
- Configuration Tasks 329
- Configuration Example 336
- Verifying Your Configuration 337
- 310 OL-31704-02 338
- 312 OL-31704-02 340
- Configuring ADSL 344
- Verifying the Configuration 345
- CHAPTER 13 351
- Cisco EnergyWise Support 352
- 4G LTE Wireless WAN 353
- Modem Firmware Upgrade 356
- Troubleshooting 356
- CHAPTER 15 357
- Configuring DHCP and VLANs 358
- Configuration Example: DHCP 360
- CHAPTER 16 365
- 338 OL-31704-02 366
- CHAPTER 17 379
- 352 OL-31704-02 380
- Restrictions 381
- Configuration Examples 385
- Deployment Scenarios 387
- Enterprise Small Branch 388
- OL-31704-02 361 389
- SMB Applications 390
- OL-31704-02 363 391
- 364 OL-31704-02 392
- Getting Started 393
- ADSL Troubleshooting 394
- SHDSL Troubleshooting 394
- VDSL2 Troubleshooting 395
- ATM Troubleshooting Commands 397
- Router# debug atm errors 399
- OL-31704-02 371 399
- Software Upgrade Methods 402
- Recovering a Lost Password 402
- Reset the Router 404
- 380 OL-31704-02 408
- APPENDIX A 409
- Understanding Command Modes 410
- OL-31704-02 383 411
- Getting Help 412
- Using Commands 414
- Abbreviating Commands 415
- Undoing Commands 415
- Command-Line Error Messages 415
- Saving Configuration Changes 416
- Concepts 417
- Network Protocols 418
- Routing Protocol Options 418
- PPP Authentication Protocols 419
- 392 OL-31704-02 420
- Network Address Translation 421
- Easy IP (Phase 1) 421
- Easy IP (Phase 2) 422
- Network Interfaces 422
- ATM for DSL 423
- Dialer Interface 423
- Dial Backup 424
- IP Precedence 425
- Access Lists 426
- ROM Monitor 427
- ROM Monitor Commands 428
- Required Variables 431
- Optional Variables 431
- Configuration Register 433
- Console Download 434
- ROM Monitor Debug Commands 435
- Exiting the ROM Monitor 437
- 410 OL-31704-02 438
- OL-31704-02 IN-1 439
- IN-2 OL-31704-02 440
- OL-31704-02 IN-3 441
- IN-4 OL-31704-02 442
- OL-31704-02 IN-5 443
- IN-6 OL-31704-02 444
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